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A140252 as a simple table

n a(n)
0 0
1 1
2 1
3 7
4 7
5 31
6 31
7 127
8 127
9 511
10 511
11 2047
12 2047
13 8191
14 8191
15 32767
16 32767
17 131071
18 131071
19 524287
20 524287
21 2097151
22 2097151
23 8388607
24 8388607
25 33554431
26 33554431
27 134217727
28 134217727
29 536870911
30 536870911

[0,1,1,7,7,31,31,127,127,511,511,2047,2047,8191,
 8191,32767,32767,131071,131071,524287,524287,
 2097151,2097151,8388607,8388607,33554431,33554431,
 134217727,134217727,536870911,536870911]

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Last modified October 21 20:44 EDT 2019. Contains 328315 sequences. (Running on oeis4.)